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Home >> Subaru >> 2020 >> Legacy Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (2.5L) (3 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P1C00: Battery Monitor Module "A" Performance >> General Description >> Diagnostic Method

Diagnostic Method

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 1

Malfunction Criteria Threshold Value
Receives pulse discharge malfunction or Receives voltage measurement malfunction or Receives current measurement malfunction ON
ON
ON
JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 2

Malfunction Criteria Threshold Value
Battery current Less than - 1000 A
or
More than 300 A
JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 3

Malfunction Criteria Threshold Value
Battery voltage Less than 6 V
or
More than 16.2 V
JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 4

Malfunction Criteria Threshold Value
Battery temperature More than 105°C (221°F)
JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 5

Malfunction Criteria Threshold Value
Battery SOC More than 100%
JUDGMENT VALUE SPECIFICATION - DIAGNOSIS 6

Malfunction Criteria Threshold Value
|Battery current (current value) - Battery current (previous value)| 0.003 A or less

Time needed for diagnosis: 

Diagnosis 1:  Less than 1 s

Diagnosis 2, 3, 4 and 5:  10 s

Diagnosis 6:  60 s

Malfunction indicator light illumination:  Does not illuminate.